Set-screw or the like.



D. S. GOODWIN.

SET SCREW OR THE LIKE.

11101111011 FILED 1111.7, 1911.

1,075,710. Patented 061.14, 1913.

INVENTOR. D5. GOOdU/L'n 911- W I BY.

1n; ATTORNEY.

@NTTE vi NT @FFTQE.

DWIGHT S. GOODWIN, 0F WATER/BURY. CONNECTICUT, ASSIGNOR T0 OSCAR- S.FITZSIMONS, OF WATERBUBY, CONNECTICUT.

SET-SCREVI OR THE LIKE.

Specification of Letters Patent.

T 0 all whom it may concern:

Be it known that I, DWIGHT S. GoonwrN, a citizen of the United States,and a resident of Waterbury, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements in Set-Screws or. the like, of which the following is a specification.

The object of my invention is to produce a device of the characterdescribed having features of novelty and advantage which will behereinafter set forth.

Referring to the drawings Figure 1 is a plan view of the set screw. Fig.2 is a central vertical section thereof. Fig. 3 is an end view of the oerative art of the wrench. Fig. 4 is a s1de view t ereof. Fig. 5 is anend view of the set screw showing in section the operative part of thewrench in position therein.

The set screw formin the subject matter of this invention is of t e typesocketed: in its outer end to receive a wrench, the socket and wrenchbeing fitted to form a driving connection so that the set screw can beoperated by the wrench. I am aware that set screws and wrenches of thisgeneral type have been made heretofore but no particular attention hasbeen paid to the character of the engaging faces of the wrench and setscrew, and no account has apparently been taken of the fact that thewalls of the socket are so thin that the end of the set screw is liableto be spread under the action of the wrench tending to cause it to bindtightly in place. For instance in a case where the socket and wrenchwere of hexagonal cross section the tendency of the wrench is to spreadthe set screw causing it to bind and the harder the wrench is turned thegreater this binding effect is. By my invention I have overcome thisdifficulty by so forming the engaging faces of the wrench and socketthat when the wrench is turned there will be no tendency to expand thesocket end of the set screw and the tendency will be to contract it.

Referring to the drawings wherein one embodiment of my invention isillustrated a end is solid. The side wall of the socket has severalrecesses 2, the outer walls-of which recesses are concentric and the endwalls are oppositely inclined or converging as shown. The right hand endwall of each recess is acted upon by the operating means when the screwis driven toward the right, and the left hand end wall is acted uponwhen the screw is driven toward the left. In order to effectivelyovercome the tendency of the socketed outer end to expand, each of thesaid end walls must incline rearwardly inward with reference to thedirec tion that it is pressed upon by the operating means, andfurthermore, the said operating means must bear upon the inclined facesof certain end walls which thereby have a wedging effect tending tocontract the socketed end of the screw. The planes of the end walls ofeach recess are such as to pass from each end wall inwardly to the oppo-Patented Get. 14, 19513.

site side of the axis from that on which the said end wall is located,whereby the said planes meet at a point within the radii which arecentrally disposed with relation to the recesses.

The wrench c is fluted as at 10 to form. projecting ribs 11 of size andshape to fit the recesses in the wall of the socket. Preferably thewrench is slightly tapered to facilitate fitting it in place.

By my improvement, the coacting faces of the wrench and end walls of therecesses 2, are so inclined that the pressure of the wrench on thedriven end walls has a tendency to contract the socket and therebyprevent any enlargement of the outer end of the screw. This enables meto make thinner socket walls than could otherwise be made and thus I cansafely make larger sockets in proportion to the size of the screw. Thescrews, in use, may have their outer end completely sunk within threadedholes and may be repeatedly screwed in and out with all necessary forcewithout impairing the outer end of the screws.

1 claim as my invention,

1. A. rotating member having asocketed outer end provided with severalrecesses each of which has a concentric outer wall and inwardlyconverging end walls, the latter being arranged in planes that crosseach other-between each respective recess and the axis of the saidmember, whereby the said inwardly converging end walls have a a generalcylindrical body and a socketed outer end provided with recesses in theWall thereof, each of the said recesses having end walls inclinedinwardly in planes passing between the said recess and the axis of thesaid screw, whereby the said inclined end walls have a tendency tocontract the said socketed end when acted upon by suitable operatingmeans.

DWIGHT S. GOODWIN.

Witnesses .JANE Gr. BERGIN, I. F, BACHELDER.

